Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
A = (5\(x\) + 1)2 + (5\(x\) - 1)2 - 2.( 5\(x\) +1).(5\(x\) - 1) tại \(x\) = 1
Thay \(x\) = 1 vào A ta có:
A = (5.1 + 1)2 + (5.1 - 1)2 - 2.(5.1 + 1).(5.1 - 1)
A = 62 + 42 - 2.6.4
A = 36 + 16 - 48
A = 52 - 48
A = 4
(x2-5x+1)2+2(5x-1)(x2-5x+1)+(5x-1)2
= [(x2-5x+1)+(5x-1)]2
= (x2-5x+1+5x-1)2
= (x2)2
= x4
(x2 - 5x + 1)2 + 2(5x - 1)(x2 - 5x + 1) + (5x - 1)2 = (x2 - 5x + 1 + 5x - 1)2 = (x2)2 = x4
C = ( x2 - 5x + 1 )2 + ( 5x - 1 )2 + 2( x2 - 5x + 1 )( 5x - 1 )
= [ ( x2 - 5x + 1 ) + ( 5x - 1 ) ]2 ( HĐT số 1 )
= ( x2 - 5x + 1 + 5x - 1 )2
= ( x2 )2 = x4
P = (5x − 1) + 2(1 − 5x)(4 + 5x) + (5x+4)\(^2\)
= 5x – 1 + (2 – 10x).( 4+ 5x) + (5x+4)\(^2\)
= 5x – 1 + 8 + 10x – 40x – 50x\(^2\) + 25x\(^2\) + 40x + 16
= ( - 50x\(^2\) + 25x\(^2\) ) + ( 5x + 10x – 40x + 40x) + ( - 1+ 8 + 16 )
= -25x\(^2\) + 15x + 23
\(P=\left(5x-1\right)+2\left(1-5x\right)\left(4+5x\right)+\left(5x+4\right)^2\)
\(P=5x-1+\left(2-10x\right)\left(4+5x\right)+\left(5x+4\right)^2\)
\(P=5x-1+8+10x-40x-50x^2+25x^2+40x+16\)
\(P=\left(25x^2-50x^2\right)+\left(5x+10x-40x+40x\right)+\left(-1+8+16\right)\)
\(P=-25x^2+15x+23\)
\(=25x^2+10x+1+25x^2-10x+1+2\left(25x^2-1\right)\)
\(=50x^2\)\(+2\)\(+50x^2\)\(-2\)
\(=100x^2\)
= 100 x mũ 2